Drill-sharpener.



T. H. dz A. L. PROSKE.

DRILL SHARPENER. APFLiCATIONjI LI-ID DEC.23.1-9i6.

Patented Mar. 12, 1918.

5 SHEETS-SHEET I.

J TAG wag ofizPrgieg T. H. & A. L. PROSKE.

DRIL L SHARPENER.

APPLICATION FILED 02c. 23. ms.

Patented Mar. 12,1918.

T. H. & AIL. PROSKE.

DRILL SHARPENER. APPLICATION FILED DEC. 23. I915.

Patented Mal-.12, 1918, I

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wuewlio u T. H. 6; A. L. PROSKE.

DRILL SHARPENER. APPLIGATNN mm DEC. 23. me.

Patented Mar. 12, 1918.

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UNITED s'ratrns PATENT OFFICE. y

THEODORE I-I. PBOSKE AND ALEXANDER Ii. PROSKE, 0F DENVER, COLORADO.

DRILL-SHARPENER.

7 Sp eeification of Letters Patent.

Patented Mar. 12, 1918.

Application filed December 23, 1916. Serial No. 138,672.

To all whom it may concern:

Be it known that we, THEODORE H. PROSKE and ALEXANDER L. Pnosnn, citizens of the United States, residing at the city and county of Denver and State of Colorado, have invented certain new and useful Improvements in Drill-Sharpeners; and we do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this specification.

Our invention relates to improvements in drill sharpening apparatus of the class in which the drill steel is clamped in place and acted on by a dolly which in turn is actuated by a reciprocating hammer. Our object is to Provide an apparatus of this class which shall be comparatively simple in construction, economical in cost, reliable durable and eilicient in use and which shall require practically no skill on the part of the operator, since the device is to a great extent automatic in operation.

In our improvement one of the novel features consists in the construction whereby the drill steel is clamped or secured in place preparatory to the sharpening operation. This construction consists of a piston-op erated rack toothed on its opposite edges and engaging two gears respectively mount ed and made fast on shafts which are equipped with eccentric disks which engage openings formed in blocks which are equipped to engage the drill steel in clamping relation. As the said rack is moved in one direction the blocks are actuated to clamp the drill steel, while when it is moved in the opposite direction the blocks are actuated to release the drill steel. When the blocks are in the released or open position, the drill steel may be laid in place between them and properly adjusted, after which it is securely clamped in place. As soon as this happens the actuating fluid as air, is allowed to pass from the chest which it originally enters, to the valve mechanism of a. reeiproc'able hammer mounted in a cylin- .der and connected to act upon the dolly for upsetting and sharpening the point or head ,of the drill steel.

Having hrieflv outlined our improved construction, we proceed to'describe the same in detail, reference being made to the accompanying drawing, in which is illustrated an embodiment thereof.

In this drawing Figure 1 is a side elevation of our improved machine.

Fig. 2 is a top plan view ofthe same.

I Fig. 3 is a horizontal section taken on the line 33, Fig. 1, looking downwardly.

Fig. 4; is a fragmentary view of the same shown on a larger scale.

Fig. 5 is the same as Fig. 4 but with the operating parts in different relative posi tions.

Fig. 6 is a top' view of the clamping blocks shown partly in section, taken on the line 66, Fig. 7.

Fig. 7 is a view looking in the direction of arrow 7, Fig. 6, being a face view of the clainping blocks showing the drillsteel in place. In Fig. 6, however, the full lines indicate the open position of the clamping or die blocks, while in Fig. 7 these blocks are shown in the closed position.

Fig. 8 is a horizontal section taken on the line 88, Fig. 1, the parts being shown on a larger scale.

The same reference characters indicate the same parts in all the views.

Let the numeral 5 designate a chest which receives motive fluid as air at one extremity through a supply pipe 6. This chest is secured to the side 7 of a cylinder 8 in which is located an operating piston 9. The cylinder is reinforced on the side 7 where the chest is secured and in this reinforcement are formed passages 10 and 12 which open at one extremity into the chamber 13 of the chest. The reinforced side 7 of the cylinder is also provided with an exhaust port or passage 141 which is arranged between the two passages 10 and 12. In the chamber of the chest 5 is arranged a slide valve 15 composed of two-parts 16 and.17. The part 17 is angle-shaped, one of its parts 18 having a perforation 1.9 through which the stem 20 of a piston 21 passes, the slide valve member being secured tothe rod by nuts 22' and 23 threaded on the stem and engaging the part 18 of the slide valve member in opposing relation. One extremity of the slide valve member 16 engages the nut .23 opposite the part 18 of the member 17 while the opposite extremity of the member 16 is acted on by a spiral spring 24 ;vvhich surrounds-the s e nv andis arranged between the valve member 16 and a stop 25 on the stem. Hence, the member 16 is 'nor-m-ally yieldingly retained in engagement With the nut 23, whereby, the nor-v mal position of the two members 16' and 17 of theslide valye, is such that theyboth, engage the nut- 23; By virtue of this con struction the slide valve member 17 is. scoured against movement on the stem, while themembsr 16 is. free to slide thereon when sn licient resistance is offered to compress the spring 24,, The movement of the member 16 is limited by ofiisctsflfi and 27, formed the adj agent. face of the reinforced part 7 of the cylinder 8. It may be aSsumed that the. lalormal position of the slide-valve that; indicated in Fig. l in which the member lfiis, engagement with the ofiset 21$; When in thisfposition the passage 12 of the cylinder is in communication with a recess. 28 of the slide valve member 16; this recess being also. in communication with the exhaust passage 14: of the cylinder. Fun thermore, when, the slide valve is in the normal position or that shown in Fig. 4c, the passage 10 of the cylinder is in communication with the chamber .13 of the chest, whereby-when themotiveflu-id enters tl'IGAGlBJBSt: through; the supply pipe. 6, it first fills the ohcstandi flows thence by way of the; passage 10. into. the cylinder 8 and acts on the piston 9 to move the same rearwardly or toward the left in the event that the. piston is not already at its rearward limit of movement. The piston 9 is secured to one extremity of a stem 29 which passes through a stuffing box 30 mounted on one end of the cylinder, its outer extremity being connected as shown at 31 with a rack bar 32 toothed or cogged on its opposite edges as shown at 33 to engage gears 34 and 35 which are respectively secured to shafts 36 and 37' which are equipped with eccentric parts orcams 38 and 39 which fit closely in openings 40 and 41 formed in blocks 42 and 43 which are equipped with dies 44; and 15. arranged to clamp the drill steel e67. These dies for the greater part of their length, are slightly concaved as shown at 4e? and; a8: to fit the cylindrical portion of the drillsteel'. However, from a point 49 {see Fig. 6) the recesses of these dies are enlarged, gradually increasing; to their for ward extremities so that when the dies are closed (see Fig. 7) these enlarged recesses or cone-shaped parts 50- and 5-1,directly engage the head 52 of the drill; steel upon which the dolly 53 acts for sharpening purposes. This dolly is equipped with a stem which enters a cylinder 55 in which is located a reciprocable hammer (not shown). hammercylinder is equipped with valve-mechanism 56' which receivesmpt-iye througha pipe or conduit 57 Whose extremi y remote tram th -ham m.

der, is in communication with the chest 5 by Way of a port 58.

The chamber 13 of" the chest 5 has an opening 59 at its bottom which is in communication with one extremity of a pipe 60 whose opposite extremity is in communication with" a port 71 of a valve casing 72 which is also provided with three other ports designated 73, 74 and 75 respectively, the latter being an exhaust port (see Fig. 8). Leading from the, casing 72 and in communication with the. port 73: thereof, is a pipe 76 which communicates with a port 77 of'a small cylinder 62. Another pipe 78 communicates with the port 74 of the casing 72 at one extremity while its opposite extremity communicates with a port 61 formed in the bottom of the cylinder 62 in which is fitted the piston 21 secured to the valve stem 20 as l'leretofore explained. The stem 20 passes through a stufling box 63 with which one extremity of the chest 5 is equipped. The opposite extremity of this cylinder is closed by a screw plug 64:. Normally a valve 66'. is

adjusted the casing '72 to. allowthe air under pressure or other motive fluid in the chamber 13, to pass. by way ofthe pipes 60 and 76, into a compartment 79 at the'right oi the piston 21 ofthe cylinder 62, a compartment 8.0. of the said cylinder on the 0pposite side of said piston being. in communication with the. atmosphere by way of the pipe 78, the valve chamber 86 and the exhaust port 75. of the casing 72. Hence the piston 21 is normally held at its limit of movement toward the left whereby the slide valve is in engagement with the offset 26. However, as soon as the fluid has entered the chest 5 in suliicient volume to actuate the piston 9 and move it rearwardl y or to the position shown in Fig. 4, the valve 66 is manually operated to cut off the fluid from the compartment 79- of the cylinder 62 and cause it to enter this cylinder in the rearof the piston 21, while the port 75 of the casing 72 is placed in communication with a compartment by way of the pipe 78 whereby the slide valve member 16 is moved from the offset 26 to the offset 27. As soon as this occurs the motive fluid in the chest is allowed to flow (see Fig. 5) through the passsage 12 into the cylinder 8 in the rear of the piston 9 upon which it acts to drive the said piston forwardl orto the position shown in Fig. 5, whereby the die blocks are actuated to clamp the drill steel as heretofore explained. During this movement of the piston 9 the slide valve member 17 remains in its normal position with reference to the member 16." This normal position of the member 1'? is shown in 'full lines in Fig. 4L and in dotted lines in Fig. 5. During the movement of the piston 9 from the position shown in Fig. if to that show-11in Fig. 5, the piston 21"remai1is a dotted lineposecurely clamp the" drill steel.

' other construction.

mangoes siti'on' in 5', since the pressure is re- 'diiced slightly in the cylinder 62 while the fluid is flowing from the valve chest into the cyli'i'ider 8. However, as the area of the piston9 acted onby the fluid, is relatively large, the piston 9 is actuated to *o-peratc the rack bar 32' and actuate the die blocks to After this occurs the pressure increases in the compartment 80 of the cylinder 62 and acts upon the piston 21 to move the latter from the dotted line position in Fig. 5 to the full line position in the same figure, and during this movement of the piston 21 the slide valve member 17 is moved independently of the member 16, a sufficient distance to uncover the port 58 and allow the motive fluid to pass from the chest through the pipe 57, to the valve mechanism 56 of the hammer cylinder 55. As soon as this occurs the motive fluid serves to impart the usual reoiprocating movement to the hammer, whereby the dolly 53 is acted on to upset and sharpen the point or head of the drill steel. Attention is called to the fact that the dolly 53 is exposed to the view of the operator or person in charge so that he may observe its action upon the drill steel, and whereby he may know when the dolly has properly performed its function. The dolly is provided with a shoulder 67 which will engage faces 68 of the die blocks when the dolly is at its forward limit of movement. If it should then happen that the drill steel is not fully upset or sharpened, the motive fluid may be cut off fromthe hammer cylinder, the die blocks opened through the medium of the piston 9, and the drill steel moved toward the left (see Fig. 6). in this event the dolly will be moved in a corresponding direction, since the fluid pressure is cut off from the hammer cylinder. As soon as the drill steel is properly adjusted, the die blocks will be actuated in the manner heretofore explained to clamp the drill steel tightly in place, after which the hammer will be operated to actuate the dolly until. the drill-sharpening operation is completed. v i

From the foregoing description the use and operation of our improvement will be readily understood. It should be explained that the construction may be employed for upsetting and shaping metal bars of any de scription Whether of the drill steel or any l Ve term the machine a drill sharpening apparatus because the use which we particularly have in mind, is the upsettingof the heads or operating points or extremities of drill steels for shaping and sharpening purposes, though it must b'eunderstood. that the invention is not limited to this particular use.

In describing. the. operation it should be assumedflthatthe chest 5. is op'en through the pipe 6' to a source of motive fluid supply.

Assuming that the vpiston 9 is at its forward limit of movement or at its limit of movement toward the right in the cylinder 8, and assuming also that the slide'valve is in its normal. position (see Fig. 4), the motive fluid will first flow through the passagelO into the cylinder 8 and act on the piston 9 to move thelatter rearwardly or to the position shown in Fig. lVe will also assume that the valve 66 is in the position shown in full lines in Fig. 8, while the compartment 7 9 of the cylinder 62 is under fluid pressure to maintain the piston 21 at its limit of movement toward the left. The valve 66 will then be given quarter turn or moved to the position indicated by dotted lines in Fig. 8, whereby the motive fluidis cut off from the compartment 79 of the cylinder 62 and allowed to enter the compartment 80, the compartment 7 9 being placed in communication with the atmosphere. The motive fluid will then act on. the piston 21 to move the latter forwardly or toward the right in. the cylinder 62 whereby the member 16 of the slide valve is placed in the position shown in Fig. 5 and the extremity ofthc passage 12 in communication with the fluid chest is uncovered and the corresponding extremity of the passage 10 opened to the exhaust. The motive fluid will then flow through the passage 12 into the cylinder 8 in therear of the piston 9 and act on the latterto drive it forwardly, whereby the rack bar 82 will be actuated to operate the gears 3st and 35 sufliciently to actuate the jaws, clamping blocks or die blocks 42 and i3 through the medium of the eccentric cams 38 and '39, whereby the drill steel 46 will be securely clamped in place, the drill steel having been placed manually in position between the jaws when the latter were open. During this operation of the piston 9 and its connections for clamping the drill steel in place,.the piston 21 has remained stationary, due to the reduction of pressure in the chest 5 due to the passage of motive fluid from the chest into the cylinder 8. However, as soon as the piston 9 is moved to actuate the jaws or clamping blocks as justexplained, the pressure will accumulate in the chest 5 and act through the pipe 60, the

casing 72 and the pipe 78 to drive the piston- 21 forwardly in the cylinder 62, this move ment being suliici'ent to actuate the slide valve member 17 (see Fig. 5) and uncover the. port 58 whereby the motive fluid is allowed to flow through the pipe 57 to the hammer cylinder 55 where it acts to reciprocate the hammer or. piston (not shown) in thefcylind'en the said hammer acting on the stem 54: of the dolly 53in cause. the latter to upset the head or pointof the drill steel. I It will thus benoted that from the time the valve 66 is movedto the. dotted line position in Fig". 8, the acticn of the piston '21 in manipulating the slide valve 16 for the purpose of controlling the supply of motive fluid to the cylinders 8 and 55, is entirely automatic, notwithstanding the fact that there must be a cessation of movement on the part of the slide valve member 17 after the passage 12 is opened to the valve chest, and until the piston 9 is actuated sufliciently to cause the clamping blocks or jaws to grasp the drill steel or other bar which it may be desired to hold in place for upsetting purposes.

Having described. our invention what we claim is:

1. A drill sharpener including a pair of eccentrically mounted clamping blocks adapted to hold a drill steel, a dolly positioned to act on the drill steel when held by the blocks, a fluid actuated hammer for operating the doll-y. apiston, means for connecting said piston in operative relation with the clamping blocks including a rack bar and cooperating nears, and means for automaticallv controlling the supply of motive fluid to the said hammer and piston.

2. A drill sharpenerincluding a pair of eccentrically mounted clamping jaws adapted to hold a drill steel.a dollv positioned to act on the drill steel when held by the jaws, a fluid actuated hammer for operating the dolly, a piston. means for connecting the piston in operative relation with the clamping jaws including a rack bar and coiinerating gears, means for automaticallv controlling the sunplv of motive fluid to the hammer and piston, said means comprising a valve chest in communication with a supply of moti e fluid and also in communication with said hammer and piston. a valve in the chest and means for actuating the valve.

3. A device of the c ass described i cludinn a pair of eccentr callv mounted clampinn: jaws adapted to hold a bar. a dollv positioned to act on th bar when held by the jaws. a fluid actuated hammer for operating the dollv. a. p ston, means for conn cting the piston in op ra ve relation with the clampin jaws including a double rack bar and coonera ing nears. means for au omaticallv controlling the suppv of motive fluid to the hammer and piston to cause the piston to act in ad ance of the hammer, sa d means comprising a chest in communication with a sunnlv ot motive fluid and also in commun rat on with said hammer .and piston, a valve in therhest. a d means op rated bv fluid talznn from he chest for automatically actuating the valve.

4. A. dev ce of th class des r bed int-luv]- in. a pair of clam ng iaws adapted o h ld a harQa dol v posit ned to a t on .theloar when held by the iaws. a fl d act ated hammer for operatiu the dollv, a iston connected in operative relation with the clamping jaws, means for automatically controlling the supply of motive fluid to the hammer and piston to cause the piston to act in advance of the hammer, said means comprising a chest in communication with a'supply of motive fluid and also in communication with said hammer and piston, a valve movable in the chest for controlling the passage of the motive fluid, and means operated by fluid taken from the chest to automatically operate the said valve.

A device of the class described, including a pair of eccentrically mounted clamping jaws adapted to hold a bar, a dolly posi tioned to act on the bar when held by the jaws for upsetting purposes, a fluid actuated hammer for operating the dolly, a piston connected in operative relation. with said jaws tooscillate the same, and means for controlling the supply of motive fluid to the hammer and piston.

6. A device of the class described, includ ing a pair of clamping jaws adapted to hold a bar, a dolly positioned to act on the bar when held by the jaws for upsetting pur poses, a fluid-actuated hammer for operating the dolly, a piston connected in operative relation with the jaws, means for autoniatically controlling the supply of motive fluid to the hammer and piston, said means comprising a chest in communication with a supply of motive fluid and also in commu nication with said hammer and piston, a valve movable in the chest for controlling the passage of motive fluid, means operated by fluid taken from the chest to operate said valve, said means including a cylinder and a piston therein, a stem on which the last named piston is mounted, and an operative connection between said stem and said valve.

7. A device of the class described, includ ing a pair of, clamping jaws adapted to hold a bar, a dolly positioned to act on the bar when held by the jaws for upsetting purposes, a fluidactuated hammer for operating the dolly, a piston connected in operative relation with the jaws, means for automatically controlling the supply of motive fluid to the hammer and piston, said means "comprising .a chest in communication with said hammer and piston, a valve movable in the chest for controlling the passage of the motive fluid, means operated by fluid taken from the chest to operate said valve, said means including a cylinder, a piston therein, a stem on which the last named piston is mounted and. which also carries the said valve, and means for releasing the fluid pressure on one side of the last named piston and switching it to the opposite side for reversing the said pistons movement.

8. A machine of the class described, including a pair of clamping jaws adapted to hold a bar, an upsetting device positioned also in communication with the said hammer and piston, a valve movable in the chest for controlling the supply of motive fluid, a second piston, means for conducting motive fluid from the chest to the second piston, and asstem on which said valve and second piston are mounted.

9. A machine of the class described, including a pair of clamping jaws adapted to hold a bar, an upsetting device positioned to act on the bar when held by the jaws, a motivefluid-actuated hammer for operating the upsetting device, a piston connected in operative relation with the jaws, a chest in communication with a supply of motive fluid and also in communication with the said hammer and piston, a valve movable in the chest for controlling the supply of motive fluid, a second piston, a conduit leading from the chest to the second piston, a manually operable valve in said conduit, and a stem on which said chest valve and second piston are both mounted.

10. A machine of the class described, including a pair of clamping jaws adapted to hold a bar, an upsetting device positioned to act on the bar when held by the jaws, a fluid-actuated hammer for operating the upsetting device, a cylinder, a piston therein, a rack bar connected with the piston, gears engaged by the rack bar, shafts on which the gears are made fast, eccentrics carried by the shafts and fitting openings formed in the respective jaws, and means for automatically controlling the supply of motive fluid to the hammer and piston.

11. A machine of the class described, in-

eluding a pair of clamping jaws adapted to hold a bar, an upsetting device positioned to act on the bar when held by the jaws, a fluid-actuated hammer for operating the upsetting device, a cylinder, a piston mounted to. ,reciprocate therein, av rack bar carried by the pistgn, gears engaged by the rack bar, shafts apron which the gears are mounted, cam members carried by the respective shafts, the said jaws having openings in which the cam member portions of the said shafts are fitted, and means for automatically controlling the supply of motive fluid to the hammer and piston to cause the piston to act in advance of the hammer.

12. A machine of the class described, including a pair of eccentrically operated clamping jaws adapted to hold a bar, an upsetting device positioned to act on the bar when held by the jaws, a motive fluid actuated hammer for operating the upsetting device, a cylinder, a piston mounted to reciprocate therein, a rack bar connected in operative relation with the piston, gears meshing with said bar, shafts on which the gears are mounted and made fast, the shafts being respectively equipped with eccentrics or cam members, the said jaws having openings in which the eccentric or cam member portions of the two shafts are respectively fitted, a chest in communication with. a supply of motive fluid and also in communication with said hammer and piston, a valve in a chest,

Copies of this patent may be obtained {or five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

